دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: drill pipe, tubing, sucker rods, and so forth with the diameter near the top of the well larger than the diameter below.

n: A string of drillpipe or casing that consists of two or more sizes or weights.

a tubing string with more than one tubing size. Normally the smallest pipe is on bottom with larger sizes toward the top. The sizes are set to minimize flowing friction and keep the velocity above the critical level to lift fluid.

a deposit of very long carbon chain alkanes. May be associated with asphaltenes.

n: see telescoping mast. telescoping joint n: a device used in the marine riser system of a mobile offshore drilling rig to compensate for the vertical motion of the rig caused by wind, waves, or weather. It consists of an inner barrel attached beneath the rig floor and an outer barrel attached to the riser pipe and is an integrated part of the riser system.

n: The derrick that can be setted upright by lifting tackle or hydraulic system.

n: A kind of equipment of riser system of offshore floating platform,usually be used to compensate the vertical movement of platform caused by stormy waves.

natural earth currents originating as result of variations in the earth’s magnetic currents.

n: a factor for correcting volumes of oil or gas to the volume occupied at a specific reference temperature. The reference temperature most commonly used in the petroleum industry is 60�F (15.56�C).

n: the measuring error caused by the temperature of a measurement differing from the pertinent reference value.

n: 1. the rate of change of temperature with displacement in a given direction. 2. the increase in temperature of a well as its depth increases.

n: The variance ratio of temperature along with underground depth increasing.


the rate of increase of temperature per unit of depth. Varies in the world with geothermal activity. Usually between 1.1 and 2.2+ oF/100 ft.

n: an operation used to determine temperatures at various depths in the wellbore. It is also used to determine the height of cement behind the casing and to locate the source of water influx into the wellbore.

repeated, regular measurement of temperatures along a unit of depth in a well.